Electrical Resistance Welding Process
Several Electric resistance welding (ERW) processes are available for tube and pipe production. While each process has different characteristics all ERW process have one thing in common all of them produce a forged weld.
A forged weld is created by applying a combination of heat and pressure of forging force to the weld zone. A successful forged weld use the optimum amount of heat which is normally lightly less than the melting point of the material and a nearly simultaneous application of circumferential pressure to the section which forces the heated edges together.
As the name implies the heat generator by the weld power is a result of the material resistance to the flow of electrical current. The pressure comes from rolls that squeeze the tube its finished shape.
